C# 多种方式发送邮件（附帮助类）

因项目业务需要，需要做一个发送邮件功能，查了下资料，整了整，汇总如下，亲测可用～

QQ邮箱发送邮件

#region 发送邮箱
            try
            {
                MailMessage mail = new MailMessage();
                MailAddress from = new MailAddress("发件人邮箱", "工程管理平台", System.Text.Encoding.GetEncoding("GB2312"));//邮件的发件人
                mail.From = from;
                MailAddress to = new MailAddress("收件人邮箱");//设置邮件的收件人
                mail.To.Add(to);
                mail.Subject = "收款确认";
                string url = "http://wwww.baidu.com";
                mail.Body = "您好，有新的待确认收款" + url;
                mail.IsBodyHtml = true;//HTML格式，内容可以包含HMTL标签和超链接uuu 
                mail.BodyEncoding = System.Text.Encoding.GetEncoding("GB2312");//设置邮件的格式
                mail.Priority = MailPriority.Normal;//设置邮件的发送级别
                mail.DeliveryNotificationOptions = DeliveryNotificationOptions.OnSuccess;
                SmtpClient client = new SmtpClient();//邮件发送服务器
                //client.Port = 25; QQ发送邮件不用设置
                client.Host = "smtp.qq.com";    //发件人地址所在的服务器SMTP 如网易126邮箱的为smtp.126.com
                client.EnableSsl = true;
                client.UseDefaultCredentials = false; //设置用于 SMTP 事务的端口，默认的是 25
                client.Credentials = new System.Net.NetworkCredential("发件人邮箱", "授权码");//发件人邮箱登陆名和密码（生成的授权码）
                client.DeliveryMethod = SmtpDeliveryMethod.Network;
                try
                {
                    client.Send(mail);//发送邮件
                    MessageShow("发送成功");
                    Response.Write("<script language='javascript'>alert('发送成功！');</script>");
                }
                catch (System.Net.Mail.SmtpException ex)
                {

                   MessageShow(ex.Message);
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
            #endregion

效果：

注意

重要引用：

using System.Net.Mail;

其中，使用QQ发送邮件，需要使用授权码而不是QQ密码，授权码具体生成方式可以查看：http://service.mail.qq.com/cgi-bin/help?subtype=1&&no=1001256&&id=28

自定义发送邮件

附帮助类的发送邮件方式（推荐此种方式，更灵活）

邮件帮助类

  1 #region 邮件帮助类
  2     /// <summary>
  3     /// 邮件帮助类
  4     /// </summary>
  5     public static class SendMailHelper
  6     {
  7         /// <summary>
  8         /// 发送邮件
  9         /// </summary>
 10         /// <param name="request">邮件内容对象</param>
 11         /// <returns>发送邮件所遇到的异常</returns>
 12         public static string SendMail(MailRequest request)
 13         {
 14             try
 15             {
 16                 MailMessage mail = new MailMessage();
 17 
 18                 if (string.IsNullOrEmpty(request.From))
 19                 {
 20                     request.From = ConfigurationManager.AppSettings["DefaultMailFrom"];
 21                 }
 22                 mail.From = new MailAddress(request.From);
 23 
 24                 PaserMailAddress(request.To, mail.To);
 25                 PaserMailAddress(request.CC, mail.CC);
 26                 PaserMailAddress(request.Bcc, mail.Bcc);
 27 
 28                 mail.Subject = request.Subject;
 29                 mail.SubjectEncoding = System.Text.Encoding.UTF8;
 30                 mail.Body = request.Body;
 31                 mail.ReplyTo = new MailAddress(request.From);
 32                 mail.IsBodyHtml = true;
 33 
 34                 if (request.Attachments != null && request.Attachments.Length > 0)
 35                 {
 36                     for (int i = 0; i < request.Attachments.Length; i++)
 37                     {
 38                         Attachment mailAttach = new Attachment(ByteArrayToStream(request.Attachments[i].FileData), request.Attachments[i].FileName);
 39 
 40                         mail.Attachments.Add(mailAttach);
 41                     }
 42                 }
 43             
 44                 if (string.IsNullOrEmpty(System.Configuration.ConfigurationManager.AppSettings["SMTPSERVER_Show"]))
 45                 {
 46                     throw new ApplicationException("邮件服务无效");
 47                 }
 48 
 49                 //Smtp Server
 50                 SmtpClient mailClient = new SmtpClient(ConfigurationManager.AppSettings["SMTPSERVER_Show"]);
 51 
 52                 if (!string.IsNullOrEmpty(ConfigurationManager.AppSettings["SMTPSERVERPORT"]))
 53                 {
 54                     //端口号
 55                     try
 56                     {
 57                         mailClient.Port = Int32.Parse(ConfigurationManager.AppSettings["SMTPSERVERPORT"]);
 58                     }
 59                     catch
 60                     {
 61                         return "SMTP服务器端口设置错误，端口必须设置为数值型";
 62                     }
 63                 }
 64 
 65                 if (!string.IsNullOrEmpty(ConfigurationManager.AppSettings["MAILUSER_Show"]))
 66                 {
 67                     mailClient.Credentials = new System.Net.NetworkCredential(ConfigurationManager.AppSettings["MAILUSER_Show"], ConfigurationManager.AppSettings["MAILUSERPW_Show"]);
 68                     mailClient.DeliveryMethod = SmtpDeliveryMethod.Network;
 69                 }
 70                 else
 71                 {
 72                     mailClient.Credentials = CredentialCache.DefaultNetworkCredentials;
 73                 }
 74 
 75                 mailClient.Send(mail);
 76                 mail.Dispose();
 77 
 78                 return string.Empty;
 79             }
 80             catch (SmtpFailedRecipientsException e)
 81             {
 82                 return e.Message;
 83             }
 84             catch (SmtpFailedRecipientException e)
 85             {
 86                 return e.Message;
 87             }
 88             catch (SmtpException e)
 89             {
 90                 return e.Message;
 91             }
 92             catch (Exception e)
 93             {
 94                 return e.Message;
 95             }
 96         }
 97 
 98         /// <summary>
 99         /// 解析分解邮件地址
100         /// </summary>
101         /// <param name="mailAddress">邮件地址</param>
102         /// <param name="mailCollection">邮件对象</param>
103         private static void PaserMailAddress(string mailAddress, MailAddressCollection mailCollection)
104         {
105             if (string.IsNullOrEmpty(mailAddress))
106             {
107                 return;
108             }
109 
110             char[] separator = new char[2] { ',', ';' };
111             string[] addressArray = mailAddress.Split(separator);
112 
113             foreach (string address in addressArray)
114             {
115                 if (address.Trim() == string.Empty)
116                 {
117                     continue;
118                 }
119 
120                 mailCollection.Add(new MailAddress(address));
121             }
122         }
123 
124         /// <summary>
125         /// 字节数组转换为流
126         /// </summary>
127         /// <param name="byteArray">字节数组</param>
128         /// <returns>Stream</returns>
129         private static Stream ByteArrayToStream(byte[] byteArray)
130         {
131             MemoryStream mstream = new MemoryStream(byteArray);
132 
133             return mstream;
134         }
135     }
136     #endregion

View Code

补充上述帮助类中，还需要添加 MailRequest.cs 类（发送请求相关类）和 MailRequestAttachments.cs 类（附件类）

MailRequest.cs 类

using System;
using System.Collections.Generic;
using System.Text;

namespace SyncAdData.DBHelper
{
    /// <summary>
    /// 发送邮件请求
    /// </summary>
    public class MailRequest
    {
        #region PrivateFields

        /// <summary>
        /// 文件名
        /// </summary>
        private string _fromField;

        /// <summary>
        /// 返送到
        /// </summary>
        private string _toField;

        /// <summary>
        /// 抄送
        /// </summary>
        private string _copyField;

        /// <summary>
        /// 附件
        /// </summary>
        private string _bccField;

        /// <summary>
        /// 标题
        /// </summary>
        private string _subjectField;

        /// <summary>
        /// 发送人名
        /// </summary>
        private string _bodyField;

        /// <summary>
        /// 类容
        /// </summary>
        private MailRequestAttachments[] _attachmentsField;

        #endregion

        /// <summary>
        /// 发送人，多个人以分号;间隔
        /// </summary>
        public string From
        {
            get
            {
                return this._fromField;
            }

            set
            {
                this._fromField = value;
            }
        }

        /// <summary>
        /// 收件人，多个人以分号;间隔
        /// </summary>
        public string To
        {
            get
            {
                return this._toField;
            }

            set
            {
                this._toField = value;
            }
        }

        /// <summary>
        /// 抄送人，多个人以分号;间隔
        /// </summary>
        public string CC
        {
            get
            {
                return this._copyField;
            }

            set
            {
                this._copyField = value;
            }
        }

        /// <summary>
        /// 秘密抄送人，多个人以分号;间隔
        /// </summary>
        public string Bcc
        {
            get
            {
                return this._bccField;
            }

            set
            {
                this._bccField = value;
            }
        }

        /// <summary>
        /// 主题
        /// </summary>
        public string Subject
        {
            get
            {
                return this._subjectField;
            }

            set
            {
                this._subjectField = value;
            }
        }

        /// <summary>
        /// 内容
        /// </summary>
        public string Body
        {
            get
            {
                return this._bodyField;
            }

            set
            {
                this._bodyField = value;
            }
        }

        /// <summary>
        /// 附件列表
        /// </summary>
        public MailRequestAttachments[] Attachments
        {
            get
            {
                return this._attachmentsField;
            }

            set
            {
                this._attachmentsField = value;
            }
        }
    }
}

View Code

MailRequestAttachments.cs 类

using System;
using System.Collections.Generic;
using System.Text;

namespace SyncAdData.DBHelper
{
    /// <summary>
    /// 发送邮件请求附件
    /// </summary>
    public class MailRequestAttachments
    {
        #region PrivateFields

        /// <summary>
        /// 文件名
        /// </summary>
        private string _fileNameField;

        /// <summary>
        /// 文件内容
        /// </summary>
        private byte[] _fileDataField;

        #endregion

        /// <summary>
        /// 文件名
        /// </summary>
        public string FileName
        {
            get
            {
                return this._fileNameField;
            }

            set
            {
                this._fileNameField = value;
            }
        }

        /// <summary>
        /// 文件内容
        /// </summary>
        public byte[] FileData
        {
            get
            {
                return this._fileDataField;
            }

            set
            {
                this._fileDataField = value;
            }
        }
    }
}

View Code

需要的命名空间

using System;
using System.Reflection;
using System.Net.Mail;
using System.Web.Configuration;
using System.Net;
using System.IO;

其中帮助类中的服务器地址和账号密码需要在配置文件中配置

 <add key="SMTPSERVER" value="邮件服务器"/>
 <add key="MAILUSER" value="账号"/>
 <add key="MAILUSERPW" value="密码"/>

前台调用

/// <summary>
        /// 发送邮件
        /// </summary>
        /// <param name="StrUrl">根据业务需要，这里我需要传入几个拼接后的id值</param>
        /// <param name="bid">根据业务需要，这里我传的批次id</param>
        /// <param name="showemail">根据业务需要，这里我传入的是查询出来的收件人邮箱（如果是固定的更好，可以直接写死或者写成配置文件）</param>
        private void Send(string StrUrl,string bid,string showemail)
        { 
            #region 读取配置发送邮件
            string url = "http://localhost:9998/FinanceManage/CollectionManage/ConfirmCollection_Receipt.aspx?MenuID=14010600&id=" + StrUrl + "&batchID=" + bid + "";
            string body = "您好，有新的待确认收款≥ "+url;
            //string bcc = string.Empty;
            string to = "v-zhangxy52@vanke.com";//收件人
            //string cc = "";//抄送人
            MailRequest mail = new MailRequest();
            mail.Subject = "收款确认";//主题
            mail.Body = body;//内容
           // mail.Bcc = bcc;//秘密抄送人
            mail.From = "v-tangqq02@vanke.com";//发送人
            mail.To = to; //收件人
           // mail.CC = cc; //抄送人
            string sendMainResult = "-1";
            if (!string.IsNullOrEmpty(mail.To.Trim()) || !string.IsNullOrEmpty(mail.CC.Trim()))
            {

                sendMainResult = SendMailHelper.SendMail(mail);

                if (string.IsNullOrEmpty(sendMainResult))
                {
                    BaseClass.CommFun.Alert(this.up_innerCheck, "发送成功！", Page);
                }
            }
            #endregion 

        }

效果

点击确定发送之后，查看邮箱，即可看到发送内容(可根据业务需求自行调整)

刚好另一个项目中也需要用到发邮件，也是用的上述的帮助类，附效果图

至此，发送邮件功能已经全部完毕，当中不乏可以优化的地方，欢迎大家自行优化，相互交流～

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原文地址：https://www.cnblogs.com/zhangxiaoyong/p/6117848.html